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Definition of universal indicator noun from the Oxford Advanced Learner's Dictionary

universal indicator

noun
 
/ˌjuːnɪˌvɜːsl ˈɪndɪkeɪtə(r)/
 
/ˌjuːnɪˌvɜːrsl ˈɪndɪkeɪtər/
(chemistry)
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  1. a substance that changes colour when another substance touches it, indicating whether it is an acid or an alkali
See universal indicator in the Oxford Advanced American Dictionary
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croak
verb
 
 
From the Topic
Animals
C2
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